9.G,
Would use the LDR table from the AFM with any corrections applicable for autoland
Still - Landing Distance Required is not the same as Ground Roll Required. Normally, with a TCH of 50 ft ATDz and a 3 deg glide, the LDR will be - as you correctly point out - 1000 ft longer than the GRR, if such a term even exists - haven't dealt with ground roll since SEPs. Even an puddlejumper like the ATR doesn't have it
Still - nothing unsafe in doing it the way you suggest, you have 1000 ft to spare - on a marginal runway might be able to drag less mass in, but hey - better out to that side than the other
